You don't say what year your coach is. As stated, if it's older than a 2013 model on a Roadmaster 8 airbag chassis, Monaco had it's own specific procedure.
Extend the slides while the coach was in the ride height position (bags aired up) and the frame was straight. This is how the slides were installed at the factory, the bags were aired up and the chassis was sitting in its normal ride position. Dump the air and then extend the three jacks. If you have a manual jack system, you extend the two rears first and then the front. Once all are in contact, correct the side to side to make it level.